752
P. Tiwari et al. / Carbohydrate Research 340 (2005) 749–752
(200 MHz, CDCl3): dH 5.86–5.80 (2H, m, H-2, H-3),
5.24–5.22 (1H, m, H-4), 4.85–4.80 (1H, m, H-5), 4.16–
4.13 (2H, m, H-6a,b), 3.86–3.82 (1H, m), 3.80–3.67
(1H, m), 2.25, 2.22, 2.08, 2.06 (12H, 4s, 4COCH3); 13C
NMR (50 MHz, CDCl3): dC 201.6, 201.2, 170.9, 170.5,
130.3, 126.2, 72.3, 71.0, 70.6, 64.8, 62.8, 31.0, 28.3,
21.3, 21.0; MS (FAB): m/z 313 [M+1]+, 253 [MÀCO2-
CH3]+, 238 [MÀCO2CH3ÀCH3]+, 213 [C10H13O5]+,
153 [C8H9O3]+, 111 [C6H7O2]+. Anal. Calcd for
C15H20O7 (312): C, 57.69; H, 6.45. Found: C, 57.76;
H, 6.55.
Acknowledgements
Instrumentation facilities from SAIF, CDRI are grate-
fully acknowledged. P.T. thanks CSIR, New Delhi for
providing a fellowship. This project was partly funded
by Department of Science and Technology (DST),
New Delhi (SR/FTP/CSA-10/2002), India.
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25
Yellow oil; Rf (1:4, EtOAc–hexane) 0.55; ½a +12.3 (c
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;
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